<template>
  <el-dialog
    width="500px"
    title="员工导入"
    :visible="showExcelDialog"
    @close="$emit('update:showExcelDialog', false)"
  >
    <el-row type="flex" justify="center">
      <div class="upload-excel">
        <!-- input
         type="file" 文件选择器
         accept 接受上传的文件类型 .xlsx .xls
         -->
        <input
          ref="excel-upload-input"
          class="excel-upload-input"
          type="file"
          accept=".xlsx, .xls"
          @change="handleUploadChange"
        >
        <div class="drop">
          <i class="el-icon-upload" />
          <el-button type="text" @click="downloadTemplate">下载导入模板</el-button>

          <span>将文件拖到此处或
            <el-button type="text" @click="handleUpload">点击上传</el-button>

          </span>

        </div>

      </div>

    </el-row>

    <el-row type="flex" justify="end">
      <!-- update:props属性名，值 直接修改 .sync修饰符的属性值 -->
      <el-button size="mini" type="primary" @click="$emit('update:showExcelDialog', false)">取消</el-button>

    </el-row>

  </el-dialog>

</template>

<script>
import { getImportEmployee, uploadExcel } from '@/api/employee'
import FileSaver from 'file-saver'

export default {
  props: {
    showExcelDialog: {
      type: Boolean,
      default: false
    }
  },
  methods: {
    // 文件选择器事件监听 (文件上传)
    // change 改变 -> 上传的文件内容发生改变了之后, 才会触发
    async handleUploadChange(e) {
      // 1. 获取上传的文件信息
      const files = e.target.files
      // console.log('文件上传了', files[0])
      // 用户取消了上传的行为
      if (files.length === 0) return
      // 2. 获取用户上传的文件
      // 3. 生成一个formData对象
      const formData = new FormData()
      // 4. 将文件添加到formData对象中
      formData.append('file', files[0])
      // 5. 调用上传接口
      try {
        await uploadExcel(formData)
        // 一旦成功 重新加载数据&关闭弹层
        this.$emit('updateSuccess')
        this.$emit('update:showExcelDialog', false)
        this.$message.success('上传员工信息成功')
      } finally {
        // 清空文件选择器的值
        this.$refs['excel-upload-input'].value = ''
      }
    },
    // 上传员工信息
    handleUpload() {
      // 1. 让文件选择器显示出来 - 自动触发点击行为 模拟点击行为
      this.$refs['excel-upload-input'].click()
    },
    // 下载员工模板
    async downloadTemplate() {
      const res = await getImportEmployee()
      FileSaver.saveAs(res, '新员工导入模板.xlsx')
    }
  }
}
</script>

<style scoped lang="scss">
    .upload-excel {
      display: flex;
      justify-content: center;
      margin: 20px;
      width: 360px;
      height: 180px;
      align-items: center;
      color: #697086;
      .excel-upload-input {
        display: none;
        z-index: -9999;
      }
      .btn-upload,
      .drop {
        border: 1px dashed #dcdfe6;
        width: 100%;
        height: 100%;
        text-align: center;
        line-height: 160px;
        border-radius: 8px;
        display: flex;
        flex-direction: column;
        justify-content: center;
      }
      .drop {
        line-height: 40px;
        color: #bbb;
        i {
          font-size: 60px;
          display: block;
          color: #c0c4cc;
        }
      }
    }
</style>
